STMicroelectronics L3751
L3751 - Wide 6 V to 75 V input voltage synchronous buck controller
The 6 V to 75 V wide input voltage range L3751 synchronous buck controller features extreme voltage conversion ratio over switching frequency range (100 kHz - 1 MHz) thanks to 40 nsec minimum conduction time.
The diode emulation (DEM) implements pulse skipping mode that maximizes the efficiency at light-load giving controlled output voltage ripple. The forced PWM (FPWM) over the load range makes the switching frequency constant and minimizes the output voltage ripple.
The Power Good open collector output validates the regulated output voltage for monitoring and it is useful to implement output voltage sequencing for digital ICs during the power-up phase.
An embedded gate driver minimizes the number of external components and it is designed for standard VTH MOSFET.
Embedded protections–output overcurrent, input voltage UVLO, internal voltage monitoring, thermal shutdown - feature controlled and safe operation for critical environments in telecom, networking and industrial applications.
The device is available in a QFN 20 leads 3.5 x 4.5 mm package with wettable flanks.
Features
- Wide 6 V to 75 V input voltage range
- Adjustable output voltage from 0.8 V to 60 V
- 100 kHz - 1 MHz switching frequency range
- 40 nsec minimum on-time for extreme duty ratio
- Low dropout operation during line transient
- Adjustable soft-start or input voltage tracking
- Pulse skipping or forced PWM operation at light load
- Synchronization
- Adjustable precision enable
- Power Good open collector output validates VOUT
- 7.5 V gate drivers for standard VTH MOSFETs
- Constant current protection with hiccup mode
- Precision or lossless programmable current sensing
- Improved line transient response
- Input voltage undervoltage lockout
- Internal voltage monitoring
- Thermal protection
- Operating junction temperature range: -40 °C to 150 °C
STEVAL-L3751V12, 75 V 15 A DC-DC converter buck regulator evaluation board with L3751 controller
The 6 to 75 V wide input voltage range STEVAL-L3751V12 synchronous buck evaluation board features an extreme voltage conversion ratio over switching frequency.
The board provides a regulated 5 V output at 230 kHz switching frequency. The output voltage can be easily set to 12 V using a jumper connector. Different voltage output can be selected by changing a resistor to a lower VIN range.
The STEVAL-L3751V12 is a 100 W demo board. The default maximum current is set to 15 A. It can be easily selected by changing a resistor.
The evaluation board is based on the L3751 synchronous buck controller, which implements the voltage mode in a VQFN package with internal compensation to minimize the design complexity and size.
The diode emulation (DEM) implements the pulse-skipping mode, which maximizes the efficiency at light-load with a controlled output voltage ripple.
The forced PWM (FPWM) over-the-load range makes the switching frequency constant and minimizes the output voltage ripple.
The power good open collector output validates the regulated output voltage for monitoring. It implements the output voltage sequencing for digital ICs during the power-up phase.
The embedded gate driver is designed for standard Vth MOSFET and minimizes the number of external components.
The embedded protections, such as the output overcurrent, the input voltage UVLO, the internal voltage monitoring, and the thermal shutdown at 150°C degrees, feature a controlled and safe operation for critical environments in telecom, networking, and industrial applications.
You can use the eDesignSuite software tool to configure the L3751 buck converter and satisfy the application requirements.
Features
- 6 to 75 V wide input voltage range
- Selectable two-output voltage level: 5 V or 12 V
- 230 kHz switching frequency setting
- Low drop-out operation during line transient
- Pulse skipping or forced PWM operation at light load
- Synchronization from 185 to 345 kHz
- Power good open collector output validates the VOUT
- 7.5 V gate drivers for standard VTH MOSFETs
- Constant current protection with hiccup mode
- Current sensing on rds-on low-side
- Improved line-transient response
- Input voltage undervoltage lockout
- Internal voltage monitoring
- Thermal protection
- Operating junction temperature range: -40 to 150°C
silica content library/npi/2022/stmicroelectronics-l3751
STMicroelectronics L3751 Synchronous Buck Controller | Avnet Silica
